Improvement in shields for feed-air pipes for hot-air furnaces



B. C. BIBB.

Shield for Feed Air-Pipes for Hot-Air Furnaces.

No. 126,373, Patented May 7,1872.

UNITED STATES PATENT OFFICE.

BENTLEY C. BIBB, OF BALTIMORE, MARYLAND.

IMPROVEMENT lN SHIELDS FOR FEED-AIR PIPES FOR HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 126,373, dated May 7,1872.

To all whom it may concern:

Be it known that I, BENTLEY C. B11213, of Baltimore, in the county ofBaltimore and State of Maryland, have invented a new and useful devicefor controlling the action of the air infeed-air pipes for furnaces,fire-places, stoves and steam-heaters; and 1 do hereby declare that thefollowing is a full, clear, and exact description thereof.

Most furnaces, steam-heaters, fire -places, stoves, &c., obtain theircold air from outside the building through an exposed register insertedin the wall. This arrangement is liable to serious objections andinconvenience. When the wind blows heavily facing the register it entersthe furnace through the feed or cold-air pipe with such force as tocarry the cold air, sand, and dust into the rooms or interior of thebuilding. Again, when the wind blows from the opposite direction thisaction is reversed. The cold-air pipe becomes a hotair pipe, the hot airbeing, by a natural law,

drawn or sucked through thisconduit or feedair pipe into the street. Itis manifest, in either case, not only is a serious inconvenienceoccasioned, but great discomfort ensues in consequence of the partialand defective heating caused thereby.

My invention overcomes this eccentric influence of the air by socontrolling it at its entrance into the feed-air pipe as to insuresteady and uniform action, and has been found, after a thoroughpractical test, to meet all the requirements of the case. It consists inan adjustable hood or cover, made of metal, wood, or any other materialdesired, and of any shape preferred, placed over the mouth of theopening of the feed-air pipe, or over the surface of the register, itssize being proportionate to the size or capacity of the feed-air pipe orconduit, so that it will not interfere with the free and unobstructedingress of the air. This hood is made adjustable by means of thearrangement as shown in the drawing accompanying this specification, asfollows:

A represents a section of the wall of a buildin g, with the registerBand opening 0 of the feed-air pipe or conduit to the furnace, &c. Drepresents an adjustable hood, placed in working position, showing theprojecting ends of its slide-plate d d, which are attached to each sideof the hood, with holes perforated therein for the reception of thethumb-screws or stop-pins e e, which are used to keep the hood inposition. e 0 represent thumb-screws or stop-pins, inserted in the holesof the slideplates of the hood alluded to. ff represent upright strapsor plates of metal or any other material desired, having their sidesbent over in front, or flanged so as to form dovetailed grooves for theslide-plates of the hood to work in. These grooved uprights should be ofsuf-, ficient length to enable the hood to be moved upward and downwardin the grooves any required distance. They are perforated at de siredintervals, as shown in the drawing, for the purpose of receiving thethumb-screws or stop-pins, which are intended to stop, fix, and adjustthe hood at any point desired. All-or any of the parts of this hood canbe made of of metal, wood, or other desired material.

It is manifest that by the foregoing device, which is simple and cheap,the hood can be moved easily up and down the the track or upright platesf f, and fixed or adjusted by means of the thumb-screws or stop-pins atany point desired. By properly adjusting this hood to suit the changesof the weather, the violent and eccentric influence of the atmosphereupon the feed-air pipe is prevented, and steady and uniform actionthereof is secured. During calm weather the position of the hood isimmaterial, but during stormy weather it should descend even with orsomewhat below the button of the register or opening of the feed-airpipe.

Claim.

Having thus described my device, what I claim as my invention, is-

The hood D, with its devices for its attachment to the feed air-pipe andits adjustment upon or to the same, as and for the purpose described.

The foregoing is the specification of my invention signed by me this 2dday of January, 1872.

BENTLEY C. BIBB.

Witnesses:

AUG. J. SMITH, W. H. BAYZAND.

